HYDERABAD: Covid- 19 vaccination has been halted for two days in the state owing to changes being made to CoWin portal. Health department director, Dr Srinivasa Rao, in a statement, said that vaccines will not be given on Saturday and Sunday. He cited the changes made in increased interval between first and second dose of Covishield, from 6 to 8 weeks to minimum 12 weeks as the reason. The campaign will resume on Monday, for which details of beneficiaries will be announced again.